ashtech ZY-12 Information Supplement page 108

12. PERFORM SECURITY ERASE
1. Zeroize the security key:
Type "$PASHS,ZER" <Enter>.
Observe that the command was successful with the acknowledge
response: "$PASHR,ZER,1,ZEROIZE EXECUTED".
2. The security key can also be zeroized by accessing screen 4. Press <e>
and highlight "SEC.MODULE". Press <e> and set ZEROIZE to "Y". Press
<e> twice. The messages "ZEROIZE COMMAND IN PROGRESS" and
then "ZEROIZE EXECUTED" will show on the screen if the command
was successful.
3. When the security key has been zeroized, the satellite lock status on
screen 0 will revert to "LZ" instead of "LY".
If you do not observe the proper zeroize response, repeat the command
to confirm that the security key was erased. If the security key cannot
be confirmed as erased with the proper response, immediately
notify the security officer and follow security procedures for an
incomplete key erase.
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ZY-12 GPS Receiver